Place a coin in the bottom of an empty teacup that is sitting on a table. Position yourself so that

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Place a coin in the bottom of an empty teacup that is sitting on a table. Position yourself so that the coin is just barely hidden by the near rim of the cup (that is, you cannot see the coin). Hold your head in the same place while you fill the cup with water. Now you can see the coin. Explain using a diagram. What physical principle is responsible?

 
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